2. The surface finish of the mold
When deep drawing, the two sides of the die and the edge holder are not sufficiently ground, especially when drawing stainless carbide plates and aluminum plates, scars are more likely to occur, which may lead to tensile fracture in severe cases.
3. Determination of blank size
More wrinkles and less cracks is our principle. The blank positioning design must be correct. The diameter of the drawn part of the rotating body with simple shape is not reduced. Although the thickness of the material has changed, it is basically the same as the original thickness. The degree of closure can be calculated based on the principle that the area of the blank is equal to the area of the stretched part (if trimming must be added to the trimming allowance). However, the shape and process of stretched parts are often complicated, and sometimes thinning and stretching are required. Although there are many three-dimensional software that can calculate the unfolded material, its accuracy cannot reach the 100% requirement.
Solution: sample.
A product has to go through multiple processes, and the first process is generally a punching process. First of all, it is necessary to calculate the unfolded material and have a rough understanding of the shape and size of the blank to determine the overall size of the punching die. The die and blanking process of the mold is carried out after the mold design is completed. First use wire cutting to process the blank (when the blank is large, it can be milled by a milling machine and then clamped). After repeated tests in the subsequent stretching process, the size of the blank is finally determined, and then the punch and the die of the punching die are processed.
In the flip-up process, the drawing die is tested first, and then the blank size of the blanking edge is semi-finished.
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